Dry type transformers present the most suitable solution in situations where the distribution of energy requires absolute safety and environmental friendliness. These transformers require less maintenance than oil-filled transformers, more safe to environment and have low fire hazard.
Windings and core are not installed in a tank and insulation of windings is usually made of cast resin.
They possess less space, about 2/3 of that of corresponding oil filled transformers, and their simple construction allows on-site replacement of windings.
Dry type transformers are only suitable for indoors installation because the degree of protection provided by enclosure is IP00 and are usually employed on distribution networks and in installations with voltages up to 52 kV and rated power up to 2.5 MVA, although some manufactures built this type of transformers up to 50 MVA.
Typical use of dry type transformers is:
● Multi-storey buildings
● Hotels
● Malls
● Hospitals and clinics
● Airports
● Mines
● Other places where fire safety is a great concern
Advantages of Dry Type Transformer
The main advantages of dry type transformer are given below.
● Safety for people and property.
● Maintenance and pollution-free solution.
● Easy installation.
● Side clearance is less.
● Environmentally friendly.
● Excellent capacity to support overloads.
● Reduced cost on civil installation works and fire protection systems.
● Excellent performance in case of seismic events.
● No fire hazard.
● Excellent resistance to short circuit currents.
● Long lasting due to low thermal and dielectric heating.
● Suited for damp and contaminated areas.
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